US20250219046A1 - Electrode plate, method of manufacturing electrode plate - Google Patents

Electrode plate, method of manufacturing electrode plate Download PDF

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Publication number
US20250219046A1
US20250219046A1 US18/850,858 US202318850858A US2025219046A1 US 20250219046 A1 US20250219046 A1 US 20250219046A1 US 202318850858 A US202318850858 A US 202318850858A US 2025219046 A1 US2025219046 A1 US 2025219046A1
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US
United States
Prior art keywords
metal foil
negative electrode
electrode plate
foil
exposed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US18/850,858
Other languages
English (en)
Inventor
Kazutaka Nishikawa
Michirou YOSHINO
Yasushi Taniguchi
Masahiro Nakajo
Masanori Kuroda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. reassignment PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NISHIKAWA, KAZUTAKA, TANIGUCHI, YASUSHI, YOSHINO, MICHIROU, KURODA, MASANORI, NAKAJO, MASAHIRO
Publication of US20250219046A1 publication Critical patent/US20250219046A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/75—Wires, rods or strips
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/381—Alkaline or alkaline earth metals elements
    • H01M4/382—Lithium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to an electrode plate comprised of two types of metal foils and a method of manufacturing an electrode plate.
  • An electrode plate includes: a first metal foil having a first surface and a second surface facing a direction opposite to that of the first surface, a first end and a second being arranged at ends of the first metal foil in one direction; and a second metal foil in which a third end and a fourth end are arranged at ends of the second metal foil in the one direction.
  • FIG. 3 A- 3 B shows an exemplary configuration of the negative electrode of FIG. 2 .
  • FIG. 5 is a side view showing a structure of a manufacturing apparatus for the manufacturing in FIGS. 4 B- 4 C .
  • FIGS. 6 A- 6 D show the manufacturing steps of FIG. 4 E .
  • FIGS. 7 A- 7 E show steps of manufacturing an electrode plate according to embodiment 2.
  • FIGS. 8 A- 8 H show a structure of the laminated body of FIG. 7 C .
  • FIG. 1 is a longitudinal sectional view showing a structure of a battery 10 .
  • the battery 10 includes a winding-type electrode body 14 in which a positive electrode 30 and a negative electrode 40 are wound in a spiral shape via a separator 50 , a non-aqueous electrolyte (not shown), and a metal battery case (casing body) that accommodates the electrode body 14 and the non-aqueous electrolyte.
  • a predetermined amount of non-aqueous electrolyte is injected into the battery case and impregnates the electrode body 14 .
  • the positive electrode 30 and the negative electrode 40 have a structure in which an electrode active material layer is stacked on a current collector.
  • the current collector is comprised of an aluminum foil, etc. in the case of a positive electrode and is comprised of a copper foil, etc. in the case of a negative electrode.
  • the electrode active material layer can be formed by applying an electrode mixture material to the surface of the current collector by a known coating apparatus and drying and rolling the material.
  • the electrode mixture material is obtained by kneading materials including an electrode active material, a binder, a conductive material, etc. in a dispersion medium and uniformly dispersing the materials.
  • the electrode active material is lithium cobalt oxide, lithium iron phosphate, etc. in the case of a positive electrode and is graphite, etc. in the case of a negative electrode.
  • the filter 22 and the lower valve body 23 are joined to each other at their respective peripheral portions, and the upper valve body 25 and the cap 26 are also joined to each other at their respective peripheral portions.
  • the lower valve body 23 and the upper valve body 25 are connected to each other at the central portions thereof, and the insulating member 24 is interposed between the peripheral portions thereof.
  • the battery 10 includes an insulating plate 17 and an insulating plate 18 arranged above and below the electrode body 14 , respectively.
  • a positive electrode lead 19 attached to the positive electrode 30 extends to the side of the sealing body 16 via a through hole in the insulating plate 17 .
  • the positive electrode lead 19 is connected to the lower surface of the filter 22 , which is the bottom plate of the sealing body 16 , by welding, etc.
  • the cap 26 which is the top plate of the sealing body 16 electrically connected to the filter 22 , will be a positive electrode terminal.
  • a current interrupt mechanism (CID) and a gas discharge mechanism (safety valve) are provided in the sealing body 16 . It is preferable to provide a gas discharge valve (not shown) at the bottom of the case body 15 , too.
  • FIG. 2 shows a partial cross-sectional view of the electrode body 14 accommodated in the battery 10 .
  • the belt-like positive electrode 30 constituting the electrode body 14 includes a positive electrode current collector 31 (the current collector of the positive electrode), a positive electrode active material layer 32 (the electrode active material layer of the positive electrode) formed on both surfaces of the positive electrode current collector 31 , and the positive electrode lead 19 .
  • One end of the positive electrode lead 19 is bonded to a region where the positive electrode active material layer 32 is not formed and the positive electrode current collector 31 is exposed.
  • the belt-like negative electrode 40 constituting the electrode body 14 includes a negative electrode current collector 41 (the current collector of the negative electrode) and a negative electrode active material layer 42 (the active material layer of the negative electrode) formed on the negative electrode current collector 41 .
  • the negative electrode 40 is arranged on the outer circumferential surface of the electrode body 14 accommodated in the battery case, and the negative electrode current collector 41 is exposed and an exposed portion 43 in contact with the inner circumferential surface of the battery case is provided on the side of the outer circumferential surface of the negative electrode 40 provided on the outermost circumference.
  • FIGS. 3 A- 3 B schematically show an exemplary configuration of the negative electrode 40 .
  • FIG. 3 A is a plan view of one principal surface of the negative electrode 40
  • FIG. 3 B is a sectional view along a line X-X in FIG. 3 A
  • the negative electrode 40 includes the negative electrode current collector 41 and the negative electrode active material layer 42 formed on both surfaces of the negative electrode current collector 41 .
  • the exposed portion 43 provided in the negative electrode 40 is provided on one principal surface of the negative electrode 40 and at one longitudinal end located in the outermost circumferential portion of the electrode body 14 .
  • the exposed portion 43 on the outer circumferential surface of the electrode body 14 By providing the exposed portion 43 on the outer circumferential surface of the electrode body 14 and placing it in contact with the inner circumferential surface of the battery case that also serves as the negative electrode terminal, electrical conduction between the negative electrode 40 and the battery case is achieved. Since the exposed portion 43 of the negative electrode 40 is placed in extensive surface contact with the inner peripheral surface of the battery case, the internal resistance of the battery 10 can be reduced. As a result, a battery with excellent large current discharge characteristics can be realized, and a highly safe battery can be realized because current constriction in the event of an external short circuit can be prevented.
  • a portion in which both surfaces of the negative electrode current collector 41 are exposed is formed in the innermost circumferential portion of the negative electrode 40 , and a negative electrode lead 20 is connected to the portion.
  • the negative electrode lead 20 is connected to the inner surface of the bottom of the case body 15 by welding, etc.
  • the position in the negative electrode 40 in which the negative electrode lead 20 is provided is not limited to the innermost circumferential portion (the longitudinal end opposite to the exposed portion 43 in FIGS. 3 A- 3 B ). Further, it is not necessary to provide the negative electrode lead 20 in the negative electrode 40 .
  • the negative electrode active material layer 42 is formed on the principal surface of the negative electrode 40 opposite to the exposed portion 43 of the negative electrode current collector 41 .
  • This causes the negative electrode active material layer 42 to face the positive electrode active material layer 32 of the positive electrode 30 , thereby increasing the capacity of the battery.
  • the strength of the region of the negative electrode 40 in which the exposed portion 43 is formed can be maintained, thereby making it easy to accommodate the electrode body 14 in the case body 15 .
  • the first metal foil 200 is drawn from the first metal foil roll member 100
  • the second metal foil 202 is drawn from the second metal foil roll member 102 .
  • the first metal foil 200 and the second metal foil 202 travel toward a first pressure bonding roller 110 and a second pressure bonding roller 112 forming a pair of pressure bonding rollers.
  • the second metal foil 202 and the first metal foil 200 are stacked from top to bottom in that order.
  • the second metal foil 202 is stacked on the first surface 400 of the first metal foil 200 and then the first metal foil 200 and the second metal foil 202 are bent at the bending point 440 to place the second surface 402 in contact. It is therefore possible to expose the first metal foil 200 by a simple configuration. Further, since the first metal foil 200 is exposed by a simple configuration, the electrode plate 280 that is difficult to wrinkle can be provided. Further, since the second end 412 of the first metal foil 200 and the fourth end 422 of the second metal foil 202 are aligned, it is ensured that the first metal foil 200 is exposed on the side of one surface, and the first metal foil 200 is not exposed on the side of the opposite surface. Further, the exposed area of the first metal foil 200 can be adjusted by adjusting the position of the bending point 440 . Further, since the exposed area of the first metal foil 200 is adjusted, design changes can be made easily.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
US18/850,858 2022-03-28 2023-03-23 Electrode plate, method of manufacturing electrode plate Pending US20250219046A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2022-051545 2022-03-28
JP2022051545 2022-03-28
PCT/JP2023/011582 WO2023190057A1 (ja) 2022-03-28 2023-03-23 電極板、電極板の製造方法

Publications (1)

Publication Number Publication Date
US20250219046A1 true US20250219046A1 (en) 2025-07-03

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ID=88202074

Family Applications (1)

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US18/850,858 Pending US20250219046A1 (en) 2022-03-28 2023-03-23 Electrode plate, method of manufacturing electrode plate

Country Status (5)

Country Link
US (1) US20250219046A1 (https=)
EP (1) EP4503154A4 (https=)
JP (1) JPWO2023190057A1 (https=)
CN (1) CN118901148A (https=)
WO (1) WO2023190057A1 (https=)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5545154U (https=) * 1978-09-20 1980-03-24
US10629947B2 (en) * 2008-08-05 2020-04-21 Sion Power Corporation Electrochemical cell
JP4984553B2 (ja) * 2006-01-30 2012-07-25 ソニー株式会社 二次電池用負極及びそれを用いた二次電池
US20110311854A1 (en) * 2007-01-03 2011-12-22 Greatbatch Ltd. Electrochemical Cell Electrode With Sandwich Cathode And Method For Making Same
JP2009224102A (ja) * 2008-03-14 2009-10-01 Hitachi Maxell Ltd 扁平型電池
WO2012027457A2 (en) * 2010-08-24 2012-03-01 Sion Power Corporation Electrically non-conductive materials for electrochemical cells

Also Published As

Publication number Publication date
EP4503154A1 (en) 2025-02-05
JPWO2023190057A1 (https=) 2023-10-05
EP4503154A4 (en) 2026-01-07
WO2023190057A1 (ja) 2023-10-05
CN118901148A (zh) 2024-11-05

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